Improvement in sawing-machines



dilated giant @sind @titre Laan Para: No. 99,600, lac-fz February s, -1870.

IMPROVEMENT IN sAwING-MAGHINES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern,

Be. it known that 1JoHN B. Sonnxcrt, of Matteawan, Dutchess county, New York, have'invented a new and useful Improvementin Sawing-Machines;

and I'do hereby declare that the following is a i'ull, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part otl this specification.

,This invention relates to new and valuable improvements in machines for sawing clapboards, and other description of lumber, whether to be sawed on a bevel, or at right angles with the table; and

-It consists 'in supporting the table, upon which the feed-rolls are arranged, andover which the lumber passes in heilig sawed, on pivots or truuuions, the axes of which are always on the saweline, and on the top of the table, so that the table, with the rolls, may be tipped or turned from a horizontal position to any desired angle with the saw, when bevelled lumber is to be sawed, and, by tipping the table, the saw-line, at the top ot the table, will not be vchanged with relation to the saw.

It also consists `in simultaneously and automatically adjusting the feed-rolls to the centre of the saw-line; and

tionary, while the other two are left adjustable.

Similar letters of reference indicate corresponding parts. Y Y

A represent-s the frame, by which the saw, and the table and rolls, are supported. I

B is the table, which rests upon pivots or trunnions C C, on the'bearers D D'-, at each side, these bearers being rigidly fixed to the frame. 0n these pivots the table may be turned from a horizontal or level position, atan angle diiering more or less from a right angle with the saw, as may be required.

E represents the adj listing-screw, which passes through a slot inthe bearer D, and engages with a screw-nut in the table. rIhe slot in the bearer is sufficiently long to allow the table to be tilted as much as may be desired.

When the table is properly adjusted, it is held in position by the screw, which has a collar which bears against D, as t-he screw is turned in.

It finally consists in a device forvzenderiug two of F F represent the rolls, which revolve on pivots or central arbors in the sliding blocksG. Y

i. These blocks, with the rolls', slide to and from the centre in slots in the table, but theyare connected with, and their movements are controlled by the slides H H', on the under side of the table.

The blocks G are connected with the slides H H by the` screws I, which are secured to and turn in ears I', which project upward, at right angles, from the slides, and engage with screw-nuts in the blocks.

rIhe pivots or central arbors t', of the 'rolls I, pass down through slots J, in the slides H H', as seen in iig. 4. The rolls are thus allowed `sufiicieut play laterally, to admit any required size or thickness ot' lumber. In the draw-ing, the lumber is seen in red color.

K represents the saw.

L is the saw-arbor.

.lo produce a simultaneous self-centring movement in the feed-rolls, I connects the slides H by the oscil-v lating bars on, which are fixed to the bottom ot' the table by the4 central pivot--screws n.

Tile slides H II' are constructed with a view to this connection, as they are provided with 'projecting ears, on whiclrthe jointed connection is made, as seen in fig. 4.

.As the rolls are spread apart by the insertion of varying thicknesses of lumber, they are forced sim ultaneously toward the saw-centre, by means ofa weight,

O, operating upon the lever q.

The fulcrum of this lever is on thearm p, which is attached to and projects from the table;

The connection with the slides H is made by means of the connecting-bar fr, and the cross-piece s, which latter connects the two slides H.

It will be seen, that as the points n, of the bars m, arevxed and central, the rolls, when forced asunder, will move simultaneously in opposite directions, but wiil be. drawn toward the centre by a constant force exerted by the weight O on the lever q, by means 4of the'cord and pulley t u. l

In sawing lumber, it is sometimes necessary to have two of 4the feed-rolls stationary, while' the others are left to press against the lumber.

For accomplishing this, I change 'two of the pivotscrews (say the screws marked e c) to the holes 'w w, in the cross-piece rv. By this means the slides H are fixed to the table.

Ido not confine myself to the use of a weight for the self-centring movement; a spring or springs may be used, with the same or similar result; nor to the particular method of adjusting and hoiding the table in position.

I claim as new, and desire to secure by Letters Patent- Y l. llhe-tipping-'table B, supported on the half-round trunnions GVG, whose axial line is coincident with the saw-line and the top 'ofthe table, which line is not changed by the tipping ofthe table, and carrying the adjustable feed-rolls F F', and the means of adjusting them, so that the table and rollers may all be tipped, and held inv an inclined position, ais herein described.

2. The combination of the centrally-pivoted bar m,

connected, at itsends, to the slides H H', having ears I', with the screws I, roll-carriers G, and rolls F F', constructed and operating in the manner and for the purpose herein described.

3. Rendering stationary the slides H and feed-rolls F, by removingthe screws fu, and inserting them in the holes w,whi1e the feed-rolls F remain free to'l adapt their positions to the varying thicknesses'of the lumber to be sawed.

. J OHN B. SGHENCK.

Witnesses:

FRANK BLOCKLEY, ALEX. F. RoBERTs. 

